ca125 still needed?

Because of a strong family history of ovarian cancer (my mother, my grandmother and my mother's first cousin), I underwent a propholactic hysterectomy and bilateral oopherectomy at age 40. Until then I was having a CA125 test done every year, as well as a pap smear and ultrasounds. The decision to have the surgery was made after several cysts started to form on my ovaries.

My question is now that I am 4 years post surgery, do I still need to have pap smears and CA125 tests done each year?  My gyn insists that I have them done annually and says there is still a possibility I can develop ovarian cancer, even without ovaries - is that true?

thanks